La degradación de la tierra está ocurriendo en todo el mundo y en casi todos los ecosistemas, este proceso tiene graves consecuencias medioambientales y sobre el potencial biológico y económico de la tierra. Uno de los mecanismos más importantes de la degradación de la tierra es la erosión del suelo. El suelo es un recurso natural único, frágil, imprescindible para la vegetación, para la sostenibilidad global y la calidad de vida; sin este recurso no puede haber prosperidad ni progreso. La erosión hídrica es el eje central de desarrollo de la presente publicación la cual tiene por objeto sintetizar algunos conceptos teóricos sobre la degradación y erosión de suelos, para luego avanzar sobre los modelos de estimación de la erosión hídrica.
Prólogo
Figuras y tablas
Figuras
Tablas
1. Introducción
2. Degradación de suelos
2.1. Definiciones
Desertificación
Sequía
Tierra
Degradación de tierras
Zonas áridas, semiáridas y subhúmedas secas
2.2. Factores que intervienen en la degradación
Cambio Climático
Inundaciones y deslizamientos de tierras
Erosión
Sellado y encostramiento del suelo
Compactación del suelo
Ocupación del suelo
Salinización y alcalinización de suelos y aguas
Reducción de la fertilidad
Contaminación del suelo
Reducción en el contenido de materia orgánica
Disminución de la biodiversidad del suelo
Incendios
3. Erosión de suelos: erosión hídrica y eólica
3.1. Definiciones
3.2. Factores que intervienen en la erosión hídrica
Clima
Relieve
Tipo de suelo
Vegetación
El hombre y el tiempo
4. Métodos de estimación de la erosión hídrica
5. Métodos cualitativos
5.1. Consideraciones generales
5.2. Modelo cualitativo de erosión-deposición
Definición de los grados de erosión
5.3. Programa corine
5.4. Riesgo de erosión en Francia
Suelos
Relieve – Modelo Digital del Terreno (MDT)
Uso del Suelo
Clima
Agrupamiento de clases – Características del modelo
5.5. Modelos aplicados en España
5.6. Modelos de aplicación en Europa
6. Métodos cuantitativos
6.1. Métodos cuantitativos de evaluación directa
Medidas en cuencas
Mediciones volumétricas
Simuladores de lluvia
Parcelas de erosión
La técnica del Cesio 137
Tasas de erosión en España
6.2. Métodos cuantitativos de evaluación indirecta
7. Modelos conceptuales y con base física. Mecanismos de erosión hídrica
7.1. Consideraciones generales
7.2. Mecanismos de erosión hídrica
7.3. Un acercamiento a los modelos conceptuales
7.4. Un acercamiento a los modelos con base física
8. Modelos estadísticos
8.1. Formulaciones de interés
Fournier (1960)
Jansen y Painter (1974)
Dendy y Bolton (1976)
Ciccacci et al. (1987)
Das y Agarwal (1990)
Verstraeten et al. (2003)
8.2 Degradación específi ca en cuencas y pérdida de capacidad en un embalse
9. Modelos parametricos. USLE/RUSLE
USLE/RUSLE
9.1. Factor R. Erosividad de la lluvia
Estimación de la energía cinética de la lluvia
9.2. Factor K. Erosionabilidad del suelo
Erosionabilidad del suelo
Factor K. Erosionabilidad del suelo
Factor K. El-Swaify y Dangler, 1976
Factor K. Young et al., 1990
Simplifi cación de Shirazi y Boersma, 1984
Modelo de Torri, Poesen y Borselli, 1997
9.3. Factor topográfi co. Factor LS
Factor LS en pendientes irregulares
Factor LS de Moore y Burch, 1986
Factor LS de McCool et al, 1982, 1989
Estimación del Factor LS en la RUSLE (Renard et al., 1997)
9.4. Factor cubierta vegetal. Factor C
Factor C. Wischmeier y Smith, 1965
Factor C. Wischmeier, 1975.
Efecto de la cubierta vegetal aérea
Efecto de los restos vegetales, y de la cubierta vegetal en contacto con la superficie.
Efectos residuales de la vegetación
Factor C. Dissmeyer y Foster, 1983.
Factor C. RUSLE: Renard et al. 1997
Cálculo del factor C
Discusión. Comparación de los diferentes métodos estimación.
Factor C
Adaptaciones realizadas en España
9.5. Factor P. Practicas de conservación
9.6. Pérdidas admisibles. Tolerancia a la pérdida de suelo
9.7. Errores y limitaciones en la aplicación de la USLE
Factor R
Factor K
Factor LS
Factor C
10. Otros modelos paramétricos
MUSLE. Ecuación Universal de Pérdida de suelos modificada
Aplicación de la USLE a cuencas. Onstad y Foster (1975)
USLE-M (Kinnell y Risse, 1998, Kinnell, 2000, 2001, 2005).
SLEMSA
Factor K
Factor C
Factor X
Método de Gavrilovic (1976, 1988)
11. Conclusiones
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